I know nothing except the fact of my ignorance.

The friend must be like money, that before you need it, the value is known.

All men's souls are immortal, but the souls of the righteous are immortal and divine.

Since I am convinced that I wrong no one, I am not likely to wrong myself.

To know thyself is the beginning of wisdom.

You never know a line is crooked unless you have a straight one to put next to it.

I only know that I know nothing